Re: Idle RPM jumping when engine gets wet
I see this thread is old, but... my truck did something similar. Turns out i had a minute crack in the coil pack. It would get wet and run crappy. By the next day it dried out enough to run normal. Trying to find the problem I swapped out coil packs. That's when I was able to see the crack just under the plug.
Stock 3.0 1wd w/manual trans. Pioneer Premiere head unit, 2 x 12" Fosgate P3, MB Quart 1500.1D amp, 4 pioneer premier 6 1/2"s, 4 channel V-Power Alpine highs/mids.